use 3.11 in GH

Author: CamDavidsonPilon

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: true
       matrix:
         os: ["ubuntu-latest"]
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.9", "3.10", "3.11"]
 
     steps:
       - name: Checkout source